Characterization of steam impulse turbine for two-phase flow
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abstract
2019 Elsevier Inc. The characterization of a steam impulse Terry turbine operating with single- and two-phase airwater ingestion has been performed; the air mass fraction ranged from 1.0 (single-phase air) down to 0.05. The two-phase characteristics were obtained over a range of turbine inlet pressures and turbine rotational speeds. The torque produced and the mixture flow rate through the turbine were recorded. Based upon experimental air/water measurements, the turbine Affinity Laws have been modified to include the effects of two-phase flow. All of the data collapsed onto a common power input coefficient (input) curve and a common head coefficient curve (), with each curve being a function of the flow coefficient () and the rotational Reynolds number (Re). The curves have the functional format of *ReMo, where Mo is the Morrison number. A similar analysis for the power output coefficient (output), using *RePoutput, showed that the data again collapse to a single curve of the Power Output Number (Poutput). Variation at lower air mass fractions (ma) for the Power Output Number is being investigated. The relationships of Mo and Poutput with air mass fraction and turbine inlet pressure have been established and shown to be functionally the same. With the curves input (, Re, Mo), output (, Re, Poutput), Mo (air mass fraction, inlet pressure) and Poutput (air mass fraction, inlet pressure), the performance of the Terry turbine can be predicted for all airwater, two-phase operating conditions.
